Question: Where is the river mouth of the Uruguay river?
Paraphrase: Do you know where the river mouth of the Uruguay River is located?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q18278 wdt:P403 ?X . ?X wdt:P974 ?answer}
Answer: Uruguay River, Paraná River, Samborombón, Salado River, Santa Lucía River, de las Vacas, Carrasco Creek, Cufre River, Miguelete Creek, Arroyo Pando, Pantanoso Creek, Riachuelo creak, Arroyo Solís Chico, Arroyo Solís Grande, de las Víboras stream, Rosario River, San Juan, Maldonado Stream, Luján River